the MK1 sled has a differant connector (with fewer contacts) than the MKII, also the connector is in a differant place (center of the unit rather than the left edge on the MKII).

There may be other differances but that is more than enough for them not be directly interchangable.

Mark.
20GB MKII 090000916
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Mark. [blue]MKI, MKII & MKIIa, all Blue, and all Mine![/blue]